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Note 1 - Summary of Significant Accounting Policies - Self-insurance Reserves (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Beginning balance, January 1, | $ 43,604 | $ 37,501 | $ 33,995
Charged to costs and expenses | 105,739 | 121,075 | 90,299
Due to acquisitions | 0 | 0 | 3,279
Payments made | (103,907) | (114,972) | (90,072)
Ending balance, December 31, | $ 45,436 | $ 43,604 | $ 37,501

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- Definition The amount of increase in self insurance reserve due to acquisitions. + References No definition available. + Details
Name: | byd_SelfInsuranceReserveAdditionsFromAcquisitions
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of decrease in self insurance reserve due to payments made. + References No definition available. + Details
Name: | byd_SelfInsuranceReserveDecreasesFromPaymentsMade
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of increase in self insurance reserve due to charges. + References No definition available. + Details
Name: | byd_SelfInsuranceReserveIncreaseDueToCharges
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_SelfInsuranceReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant